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AL; ATTORNEY STATES. PATENT onirica.

FRIEDRICH BLLING, OF FRANKFORT-O'N-THE-MAIN, GERMANY, ASSGNGR TO THE PROMETHEUS ELECTRIC CO., OF NEW YORK7 N. Y. ,'A CORPORATION OFN EW IYOtK.

ELECTRIC COOKING VESSEL.

No. 920,906. l

Specification of Letters Patent. i

Patented Hayfl 1, 1909.

Application filed November 5, 1908*. A Serial No. 461,147.

'To all whom it may concern:

ofl such a vessel which shall be cheaper inl construction, casier to repair and more effective and economical in use than any heretofore. l

The electric cooking vessels now on the market may be divided into tl1 ree classes;

those in which the bottom'is heated, those in which the heating is effected from the side and those in which the heating is eected from both the side and the bottom. c

This invention has particular relation to that class in which only the side is heated. Vessels of this class comprise either an outer vessel and an inner vessel, which latter carries in its lower ortion near the bottom or ou its entire outside wall, heat-ing strips, resistance wires or heating collars, or an outer vessel and an innenvessel in which the inner vessel is restricted near the bottom to form a sack adapted to receive the heating'element. A

In this' latter apparatus the outer vessel, which serves as a protection for the heating means on the inner' vvessel and also has the purpose of receiving' the contact pins for the conducting wires, could be -made consider- Iably smaller than in theformer apparatus vessel or a vessel with a sack) only a small f space was left for arranging the heating elements, which can vbe arranged only near the lower edge. The comparatively small heating elements, therefore, m order to get sufficient heat had to be strongly loaded electrically and hence easily burn out. The

load, for instance, in a pot haring a content of one liter was l-O watts per square centimeter', `whereas in a vessel as hereafter described as made according to this invention the load is only 6 watts per square centimeter, so that suchlatter vessel is, even with a high vol- `tage, much less liable to burn out.

The object of the present invent-ion is furlther to cheapen the cooking utensils and to facilitate their cleaning. This is effected by placing the heating means, for example,

a 'heating ring, directly on the vessel, soldering the ring thereto and using` a small contact box carrying suitable contact-pins for conducting the current.

ln the following I have described, in conncetion with the accompanying drawings, one form of apparatus, embodying my 1nvention, the features thereof being more particularly pointed out 4hereinafter in the claims.

In the drawings. Figure l is anelevation of a cooking vessel illustrating my invention and Fig. 2 is a cross sectional View along the line A-B of Fig. l.

Similar letters lindicate similar parts throughout the several views.

The heating -eleinent preferably consists of a layer cf metal a painted on a micaplate b andthen tired (substantially as described and claimed in U. S. Patent No. 617,375 to Voight & Haetlner) to serve as a resistance, a second mica-plate c covering the layer of metal a and a sheet metal cover al resting upon said mica-plate c, the ends c, e of said sheet metal cover Z being outwardly turned as shown and clamped around vessel f over the heating element 9 this case serves a double purpose, to press the heating element against the vessel and to protect the heating element from mechanical destruction. The contact box 7L contains the adjustable contact-pins z', c' which -are adapted to contact. with conductors c,

7c in electrical connection with resistance layer o. Contact box 7L may be soldered to the lower edge of vessel f and every plumber,

to be heated. The sheet metal cover d in therefore, c'an in ashortl time repair such a utensil and it does not need-to be sent to lthe factory for that purpose, as is now the case. This advantage is of great impor- .5 tance for the reason that the, vessels are often left loaded with the current and Without containing any liquid, whereby the heating element becomes overheated and hence defective and lmust be exchanged. The repairing, which heretofore was very expensive, is considerably cheapened, because the sending of the cooking utensil to the factory and returning the same is no longer necessary. Time is also saved, and the easy exchange of the elements nis of especial importance for the export trade.

As' above stated, I prefer to solder the sheet metal cover or ring (Z to the lower edge of the vessel f. as well as solder the contact box h thereto. In the case of ring d this is most conveniently done by extending the ring over the upper and lower edges of the mica strips and soldering suchV extension edges directly to the vessel. Beads 2.5 Z, Z may be provided to assist in holding the heating element in position and to provide a. seat ZIor the same. m is a handle fastened to vessel f in any convenient way. Instead of the metal resistance described, round or flat heating wires of fine or other metals may be used. These hea-ting wires should also be pressed tightly against the wall of the vessel as is the case with t-he element above described. The wires may be wound directly onto the pot, provided with a corresponding insulation and then covered and pressed by the collar-like tension strip or ring as described.

A cooking utensil as described, has the 4o further advantage that when it is in circuit..

and not containing any liquid, the contact box may melt oi, so that the heating element proper is not destroyed. The contact box can, in a short time, be soldered on agan, so that the apparatus can .again be USG It is obvious that the construction and arrangement of parts may be varied without departing from the spirit of the invention and I do not restrict myself to the details' shown.

What I claim and desire to secure by Letters Patent is Il. In an electric cooking vessel, a heating element placedA directly on the vessel and a projecting strip soldered to said vessel over said element and insulated from said element.

2. In an electric cooking vessel, a resistance comprising a strip of liquid metal fired onto an insulatmg strip, a second insulating strip covering the tired liquid metal, a metallic ring covering said second insulating strip and means whereby said ring presses the other parts firmly against the wall of the vessel.

3. In an electriq.l cooking vessel, a resistance, a metallic ring insulated from said resistance and adapted to press said resistance against the wall of the'vessel and a Contact box adapted to be soldered to the wall of the vessel and provided with contact-pins adapted to conduct current to\ said resistance.

' In testimony whereof I have hereunto signed my name in the presence of two subscribmg witnesses.

FRIEDRICH BLLiNG.

IVitnesses JEAN GRUND, CARL GRUND. 

